Default modeling procedures locate object boundary conditions along the centroid of the cross section. When a simply supported (pin-pin) frame object is modeled with a top-center or bottom-center insertion point, internal constraints are generated which have the effect of a vertical offset. A kinematic result of this modeling technique is the generation of longitudinal forces which act on an arm about the neutral axis. If this behavior is not desired, one support may be changed from a pin to a roller condition such that horizontal reactions are released. This behavior may be exhibited when bridge objects are supported by bearing links located at the bottom of the bridge girders.

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• SAP2000 V14.2.3 model (zipped SDB file)

Metadata

• Name: Effect of insertion point on beam reactions
• Description: How insertion point affects horizontal reactions and flexural response of a simply supported beam.
• Program: SAP2000
• Program Version: 14.2.3
• Model ID: 96